Engine Cradles are available in Standard Duty or Heavy Duty, both with provisions for mounting wheels and are made of 1" square tubing with black powder coating. All cradles are for V-8 engines, include Grade 5 fasteners and may be easily disassembled for storage. Standard Duty cradles accept wheel kits with 3/8" studs. Heavy Duty cradles accept wheel kits with 1/2" studs. Wheel kits sold separately.