Alpha Thread Repair Hand Installation Tool | No.22 is designed for winding a compatible wire thread insert into a correctly prepared STI tapped hole. The tool uses an adjustable collar and grub screw so the insert tang can be positioned part-way in the tool slot before installation. Apply light downward pressure while winding the insert until it sits half a turn below the surface. Tool No.22 identifies this product within the Alpha thread repair system, helping you select the correct installation tool for the matching insert size. Supplied as one hand installation tool for workshop or field thread repairs.