The stainless steel bit 1.8x12x41 mm is ideally suited for setting the screws to which the bridge is attached. Stainless steel prevents the formation of extraneous rust on stainless steel components. The input jacker included in the set allows the output socket to be safely positioned at installation and removal. The external hex socket is loosened or tightened with the Zyklop socket. String crank for guitars: With the 1/4" hexagon, the string crank can be inserted in the Kraftform 815 R bitholding screwdriver included in the set. The ergonomic shape of the handle makes it sit comfortably in the hand; the power can be charged precisely. Fits all guitar tuners. Practical metal tin for storage of picks for example. Closes firmly and permanently. Angle wrench for adjustment of the steel bar in the guitar neck. The special Hex-Plus geometry of the angle key makes for a better fit of the tool in the screw, the risk of slippage and subsequent damage is reduced, and the power transmission is clearly improved.