12Pc 3″ Boring Head R8 Shank 3/4″ Carbide Boring Bar Set Bridgeport Milling. 3/4 Boring Bar hole diameter. 3/4 Cross hole diameter. Description: 3 Boring Head. 3/4 Product application Shank Diameter No. Of Pieces Overall Length Bore Depth Min. Bore 3/4″ 12 pcs 3-1/8″ 1-1/8″ 7/16″ 3-11/16″ 1-11/16″ 7/16″ 4-1/4″ 2-1/4″ 7/16″ 3-1/2″ 1-1/2″ 9/16″ 4-1/4″ 2-1/4″ 9/16″ 5″ 3″ 9/16″ 3-7/8″ 1-7/8″ 11/16″ 4-13/16″ 2-13/16″ 11/16″ 5-3/4″ 3-3/4″ 11/16″ 4-1/4″ 2-1/4″ 13/16″ 5-3/8″ 3-3/8″ 13/16 ” 6-1/2″ 4-1/2″ 13/16 Product features Designed so that the same bar can bore flat bottomed holes or face Alloy steel shanks hardened and ground Ccarbide for steel and alloy steel 12 pc Set. Orders over a certain dollar amount will be insured and sent signature required. CANCELLATION NOTICE: Please be sure your address is correct before placing your order!