100% quality assurance tested, more responsive, less expensive, easier to install.Pushing the caliper pistons back to allow plenty of room to install the new brake pads.Damage-free, centered, tilt-free resetting of brake pistons.Ratchet mechanism makes it easy to get the most difficult of brake jobs done faster.Added plates allow for a larger length range to effectively work on larger calipers.-in small magnets and cylindrical pins, can install big plates and unload quickly.360swing skid resistance lever handle, easy to get into place.Swing the long lever handle to expand and retract the spreading plates.Both spreading plates need pressure on ratchet, to move the plates together/apart.Flip small positive and negative regulation switch on the ratchet, realize the conversion of expand and retract spreading plates.Application:For Most Trucks and Commercial Vehicles.For Disc Brake System, Not For Drum Brake For your caliper pistons do not require being turned when pressing them back.Two Small Spreading Plates: For twin and pistons fixed calipers, single and twin pistons floating calipers.Two Big Spreading Plates: For some sextuplet pistons fixed calipers.Usage Tips:1. wear gloves and goggles when use.2.The ratchet is in the centre of the dual piston brake caliper compressor, the two spreading plates keep parallel, make to spread the force on the caliper piston evenly, in case of caliper damage or pistons dislocation.3. Because of ratcheting mechanism, both spreading plates need pressure to start the ratchet, squeeze them for the first few swing until the suitable size to insert into the calipers, then go ahead to swing.Colour:blackMaterial:45 steelPackage Contents:1Set x Brake Caliper Pre ToolOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.