Ball End inserts into a screw at a 25 degree angle. Ball End saves time by quickly funneling tool into screw. 25 degree angle allows natural hand and wrist movement. Superior Ball End strength and working angle. Works in hard to reach places. Chamfered tool tips eliminate burrs and help tools seat in screw head. Sharp corners transfer more torque to the screw and reduce stripping. 1.5 to 10mm size 9 piece set.