PROFORM's Professional Crankshaft Turning Socket is for the serious engine builder and tuner. Easily attach an oversized degree wheel to the professional crankshaft turning socket and you're done! There's nothing better than an easy to read degree wheel when degreeing your camshaft!Proform Enables Rotation of Crankshaft When the Balancer is Off 67491Specifications: Keyway Size 3/16 inch Tool Type Turning Sockets & Nuts Category Crank Turning Socket Feature/Benefit PROFORM's Professional Crankshaft Turning Socket is for the serious engine builder and tuner. Color Black Description_ABR Crank Socket Description_SHO Crank Turning Socket Description_INV Pro Crank Socket Description_INV SB Chevy and Chevy V6 Description_DEF Engine Crankshaft Turning Socket Tool Description_ASC Engine Crankshaft Turning Socket Description_ASC Pro Series Description_ASC Fits SB Chevy/Chevy V6 Crankshaft Description_LAB Engine Crankshaft Turning Socket Description_LAB Pro Series Description_LAB Fits SB Chevy/Chevy V6 Crankshaft Description_DES Engine Crankshaft Turning Socket Description_DES Pro Series Description_DES Fits SB Chevy/Chevy V6 Crankshaft Description_EXT Engine Crankshaft Turning Socket Description_EXT Pro Series Model Description_EXT Fits Small Block Chevy/Chevy V6 Crankshafts Description_EXT Made from Billet Aluminum Description_EXT Matte Black Anodized Finish Description_EXT Accepts a 1/2 In. Drive Description_EXT Enables Rotation of Crankshaft When the Balancer is Off Description_MKT PROFORM's Professional Crankshaft Turning Socket is for the serious engine builder and tuner. Easily attach an oversized degree wheel to the professional crankshaft turning socket and you're done! There's nothing better than an easy to read degree wheel when degreeing your camshaft!