SpecsFully machined, High grade, Cast Iron Plates with Gray Hammertone, Chip-Resistant paint.Bar size (Plate to plate) = 36"Grade 8 aircraft quality 1/2-20, Fine Thread bolts with locking compound paste applied to bolts before assembly.Virgin Rubber Encased Steel End Plates. Steel insert is machined to a radius.30mm bar machined from 12L14 Ledloy Steel bar stock with HARD Chrome plating and a Diamond-cut, Positive medium knurl.100% thread depth in handle to assure a secure hold when bolts are inserted during assembly.2.5 lb. plate = 5" Diameter, .58" thick.5 lb. plate = 6.25" Diameter, .70" thick.7.5 lb. plate = 7.25" Diameter, .70 thick.10 lb. plate = 8" Diameter, .70 thick.