Made of hardened and tempered steel. Satin Chrome Finish. Made in USA by PEC Tools (a few models are made in England) 4R graduation shows 32nds, 64ths, 8ths, 16ths. 16R graduation shows 32nds, 64ths, 50ths, 100ths. E/M graduation shows 32nds, 64ths, 1mm, 1/2mm. 3R graduation shows 32nds, 64ths, 10ths, 50ths. 5R graduation shows 32nds, 64ths, 10ths, 100ths