Hole Duplicator, #21 Size, 18" Reach, Spring Punch Type. Size #21. 18" working length. Spring loaded. Punch type. Comes with hardened marking pin. Permits the marking sheet stock from a hidden pilot hole. Punch Duplicators have a punch tip that marks sheet stock from a hidden pilot hole. #21 drill size. 18" long. 1 lbs (0.5Kg) shipping weight.