Professional tool: : This brake caliper press is made of heavy-duty carbon steel, designed for automotive brake pump adjustment. Please note that this ratchet caliper spreader is designed to "push" the piston back, cannot twist and compress at the same time, which some brakes need. Also, the distance between the two spreader plates is 1-1/2" to 2-1/2", may not fit into a smaller caliper. 360 Drgree Ratchet: This tool adopts 360 degree rotatable ratchet design so that the spreader can be placed at any position. Plus, your hands won't get tired from the constant pressure. Instructions for use: Rotate the long handle of the lever to extend and retract the two pressure plates. spreading, and the positive and negative regulation is carried out by tilting the reverser on the pawl. Due to the ratchet mechanism, the two spreader plates need pressure to start the ratchet, please squeeze them during the first swings until the appropriate size is inserted into the stirrups, then continue swinging. Wide Fitment: : Perfect for most brake caliper pawls, truck and utility vehicle four-piston calipers, which with fixed two- and four-piston calipers, or single and dual piston floating calipers.