Features Fiberglass dissipates shock waves from the hammer head just as well as a wooden handle can, protecting your hands from fatigue or a repetitive stress injury. The PROTO® ball pein hammer features a molded jacket over the fiberglass handle to provide maximum overstrike protection. Type / Ball Pein Head Weight (Oz.) / 12.0 Handle / Fiberglass Head Weight (Lb.) / 3/4 Overall Length (In.) / 13 in Tether Style / Tether Capable Head Dia. (In.) / 1 in Head Material / Steel Meets/Exceeds / ASME