High-quality tools: The brake caliper piston retractor is made of high-hardness vanadium steel alloy, usually between 40 and 50 HRC. It has excellent wear resistance, 5 to 10 times that of ordinary steel. The head is chrome-plated to improve corrosion resistance and ensure a long service life. Quality kit: The pneumatic brake piston kit includes three parts: a main bearing shaft, an upper part, and a 4-tooth double-sided mandrel. The thickened upper part is not easily deformed and can successfully complete repair work. The 4-tooth mandrel meets various operating requirements. Efficient use: The threads on the brake piston retractor are smooth, saving time and effort. It is efficient and convenient to rotate and adjust the upper plate and reset the piston, helping you to complete the reset and replacement of brake pads more quickly. Scope of application: This brake caliper piston retraction kit can be used on most cars, trucks, buses, etc. on the market to facilitate the replacement and repair of components in the car's braking system. It is an indispensable tool for daily use. Instructions for use: When the brake pads are too rusty to be tightened, first clean the rust by hammering, loosening the piston, etc. before using the tool. Do not use brute force to avoid damaging the tool.