The socket size must match the specification of the bolt or nut. Using a socket that is too large or too small can damage the bolt head or cause the socket to crack. We recommend confirming the common bolt sizes on your vehicle (metric or imperial) before purchasing. MUMICOL socket sets cover the most frequently used size ranges to meet the vast majority of automotive repair needs.

Different vehicle models have different brake caliper structures. Front floating calipers typically only require a direct-push compression tool, while rear calipers — which integrate a parking brake mechanism — usually require a screw-type tool that simultaneously compresses and rotates the piston. MUMICOL offers a variety of brake piston compression tools; please confirm your vehicle type and caliper style before purchasing.

For some front floating calipers, a C-clamp is technically possible but carries higher risk. A dedicated tool ensures pressure is applied evenly across the piston face, preventing the piston from tilting, seizing, or damaging the dust boot. For your safety and to protect tool longevity, we recommend using a MUMICOL dedicated compression tool.

The MUMICOL brake line flaring tool is compatible with common automotive brake line sizes (such as 3/16 inch and 1/4 inch). When using it, we recommend securing the tool in a vise for stability and ensuring the tube cut is clean and flat. After flaring, inspect the flare for uniformity and check for any cracks.

A crow-foot wrench is primarily used for removing and installing specific types of nuts. Always select the size that matches your nut — never use an oversized wrench on a smaller fastener. If a nut is corroded and difficult to turn, apply a few drops of penetrating lubricant before attempting removal. Never use the wrench as a striking tool.

MUMICOL socket sets typically include a ratchet handle, multiple socket heads in various sizes, and extension bars. The ratchet handle allows the socket to operate within a small swing arc, making it ideal for working in tight spaces. Please refer to the individual product detail pages for the complete list of included accessories.

After each use, wipe down the tool surfaces with a clean cloth to remove grease and dust. If storing tools for an extended period, apply a small amount of rust-preventive oil to metal surfaces and keep them in a dry, well-ventilated environment. Avoid exposing sockets and wrenches to corrosive chemicals.

Use the extension bars or universal joints included in the socket set to change the working angle, allowing stable operation even in confined spaces or deep recesses. The ratchet handle's small-arc ratcheting design is also well-suited for use in restricted areas.

We offer a 30-day return and exchange service. If you are dissatisfied for any reason within 30 days of receiving your order, you may request a return or exchange. For returns due to product quality issues, MUMICOL will cover the return shipping costs. For returns due to personal reasons (such as change of mind or ordering the wrong item), the buyer is responsible for return shipping.

Please contact us as soon as possible through the 'Contact Us' page on our website or by emailing our customer service team. Include your order number, photos or videos of the defect, and a description of the issue. Our technical team will review your claim and respond within 2 business days.

MUMICOL tools come with a 12-month quality warranty. Under normal use conditions, if the product experiences functional failure due to material defects or manufacturing issues, we will provide free repair or replacement. The warranty does not cover accidental damage, misuse, improper use, or normal wear and tear.

Please contact us as soon as possible through the Contact Us page on our website or by emailing our customer service team. Include your order number, photos or videos of the defect, and a description of the issue. Our technical team will review your claim and respond within 2 business days.