These are high performance (very strong) 135mm H-beam rods machined from forged 4340 steel. They come with 3/8″ ARP2000 bolts. Each set of 6 is balanced to within 1 gram (including hardware).
135mm is the correct length for the M20 (E30 325i), M50/M52 (E36 325 & 328) and S50/S52 (E36 M3) 6 cylinder engines.
Big end diameter is 48mm. Small end is 22mm.
Each rod weighs +/- 499g (without bolts or bearings).
TORQUE SPEC: 50 ft/lbs with ARP molylube.
You can download instructions here.