．MODEL NO. SD-1031
．ITEM NAME. 1/2" DR Twist Socket (5 PCS)
* Size: 17, 19, 21, 22mm
* SD-1030-04 (BAR): 12mm x 80L
* Material: SNCM 439
* Hardness: 50~53 degree
The special designed set of twist sockets could especially work with nuts which could not be loosen because of rust or deformation.
The special twist shape works always more efficient than traditional ones.