Harmonic Balancer Bolt, 12-Point Black Oxide
fits GM LS Series (Not LS7) M16 X 2.0 Thread x 4.325" UHL, 1-1/16" Socket

As The Crankshaft Flexes And T wists, The Balancer Absorbs In credible Amounts Of Kinetic En ergy. To Ensure That The Balan cer Is Locked In Position Arp Has Developed These Ultra Stro ng 200,000 Psi Bolts That Let You Exert Maximum Clamping For ce. Special Features Include 1 /4 Thick, Wide Area Washer And An Extra Tall 12-point Head T hat Accepts A Deep Socket And Aliminates The Worry Of Stripp ing The Head.