Tridon 4 Jaw Hydraulic Coupler Pack Of 10 24133 It has high heat resistance Size:SDS Max It has high heat resistance and is suitable on porous and non porous surfaces making it ideal for a wide variety of applications 3 piece set to accomm odate a wide range of sizes fully hardened spring steel jaws for longer service life Incorporates a spring loaded ball check mechanism which helps retain pressure Advantage: 4 jaws allow greater working angle Hardened body withstands high pressures without deformation Hexagonal nut allows easy tightening Coupler nut & sleeve can be adjusted for variation in grease nipple sizes Before attaching nozzle to grease nipple