Feature 1Professional Design: Brake caliper compression tool features anti slip knurled handle, exhaust button, pressure plate with rubber sleeve, magnetic head and inlet interface. Made of high carbon steel for durability. 2Simple Operation: Use the brake compressor on left or right hand thread brake system wheel cylinder piston brake calipers (wind back calipers and some push back single piston calipers) with the 1/4inch air hose adapter to simplify brake jobs. 3Brake Caliper Piston Tool: Use the ratcheting brake caliper compressor tool to compress pistons quickly and easily into the calipers; Disc brake pad spreader tool creates a larger space between the caliper cavity to make room for newer and thicker brake pads. 4Ratcheting Action: Brake piston compression tool provides 360 degree swing; center located ratchet screw creates an even force when compressing the piston to ensure proper alignment and prevent damage to your brake assembly; reverse movement by flipping the switch on the handle tool to retract the compression plate. 5Easy Reset: Drain the fluids from calipers then remove the caliper and worn brake pads from your rotor assembly; Retract brake caliper press plates to fit inside the caliper cavity; Begin ratcheting slowly and steadily until the pistons have retracted completely; Retract compression plates to remove the disc brake piston tool from the caliper cavity.Item Type:BrakeCaliperPistonCompressionToolMaterial: High Carbon Steel .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x BrakeCaliperPistonCompressionToolNoteThis should work with your air compressor.