PH Part#: 6251AF Ð Aluminum Soft Jaws for 5''-10'' Chuck - 1/16''x90 - (4.375 L x 1.500 W x 2.500 H) Groove Width: 0.551 (14mm)/Screw Size: 3/8/Hole Space: 0.875 (22mm)/Hole to Front: 2.125