Sport Compact Rod BMW Mini Cooper S 2007- Prince 1.6 THP150 & THP175 CC (in) (mm) 5.454 Style PRO-H Bolt Size 5/16 Pin Width (in)(mm) 0.822 20.88 Big Width (in)(mm) 0.822 20.88 Big Bore (in)(mm) 1.8898 48 Pin Bore 20mm CP-Carrillo connecting rods are fully machined from a proprietary 4330m alloy forging for strength and durability and are available with 2 types of bolts: The standard WMC-H7 (H11) bolt with a UTS of 220ksi and our upgraded CARR-S7 (MP35N) bolt with a UTS of 285ksi. The CARR upgraded bolt is a good choice if planning on revving the engine higher than 6000rpm. All our bolts are manufactured with Asymmetrical threads, each thread has a slightly different design than the previous giving the bolts an evenly distributed thread engagement. This helps increasing the clamp load and fatigue life of the fastener. Includes Mahle steel bushing for added durability and optional Cap Relief is available to aid in oil evacuation for those that run higher loads and RPM?s lock up bearings.