Standard :
DIN 3129

Material :
Chrome molybdenum steel, surface burnished.

Version :
Sturdy shape especially for use with electric or compressed air impact wrenches. With cross hole and snap ring groove for securing sockets. Internal square to DIN 3121. With nut and bolt protection profile similar to AS-Drive profile.

Advantage :
The bolt is securely held by a spring-mounted magnet. This also ensures that the bolt head is fully engaged. The spring allows nuts / bolts to be easily removed after they have been unscrewed.