Sub Saver, 4.25" OD x 6.5" S-S 2-7/8" IF Box Pin Precision Machined For Precise Performance. Our chucks are built to the exact specifications of the original equipment manufacturer using heat-treated alloy for maximum durability.Connection: 2-7/8" IF Box x 2-7/8" IF PinHardness: 32-36... MSRP: Was: Now: $455.80 Add to Cart