Automatic, one hand operation leaves the other hand free to steady the work. Fully adjustable for strength of impact. All working parts are hardened. Mfg: Starrett SPECS: Steel. 3-53/64" (9.7cm) long. .405" (10.3mm) diameter. 1 1/2" oz. (42.5g). Knurled body and adjusting cap. Starrett #18AA.
