Ceta Form Sockets are very high quality, using a compact design, precision fit to nuts and bolts with knurls to aid non-slip gripping and a female square for perfect fit to ratcheting handle. 1/4" Drive TORX IPR Socket Bits are manufactured from high quality steel and meet all standards and tolerances. Bits are pressed directly into the socket for a permanent connection. This ensures that bits will not loosen over time under stress.