Application: 1/4-inch square sockets as well as for 1/4-inch adaptors with square drive, with ball locking device. Design - Forged, full metal ratchet (chrome-molybdenum) that is extremely robust with a long service life, slim design to enable work in very confined spaces. The dual-ratchet-teeth design means that a 76 fine-toothing division can be achieved from the 38 robust teeth with a return angle of only 4.7 degree. Simple direction change with the undetachable push-through square and very secure socket lock mechanism.