Through-hole minus screwdriver Shaft length: 10.5cm The square shaft allows for powerful tightening with a spanner or similar tool. The square shaft allows for powerful tightening with a spanner or similar tool. The oval grip provides good leverage. The through-hole type allows for hammering with a hammer. This is a product from my grandfather's shop. The item seems to be of quite good quality, but we are offering it at a reduced price due to aging.