Iron base, XRF set of 18 discs (7 mm), see BS-10V-7MM, BS-49-7MM, BS-A-10-7MM, BS-36C-7MM, BS-37D-7MM, BS-TH11-7MM, BS-TH12-7MM, BS-34D-7MM, BS-9-4-30-7MM, BS-39B-7MM, BS-TM1-7MM, BS-32C-7MM, BS-35D-7MM, BS-41-7MM, BS-33E-7MM, BS-38C-7MM, BS-TS7-7MM, BS-30C-7MM