Tool for inserting the socket into the shaft when assembling the golf club. Both rubber O-rings and spring washers are included in the set. Use as you like to prevent loosening during knocking. By manually moving the bolts and nuts to secure it, you can load the socket (ferrules) at a depth of 0.4 - 1.8 inches (10 - 45 mm). The standard is 1.1 inches (28 mm). Please prepare a separate hammer for hammering. The inner diameter of the insert is 10.5mm. Can be used with regular irons and drivers shafts and sockets. When determining the insertion depth, please adjust the depth by measuring the levers, shaft and ruler.