Proxxon parallel supports are ground in pairs. Its levelled surface helps to adjust work on drilling machine, lathes and milling machines. Made of high alloy, hardened steel 58-62 HRC. Parallel accuracy 0.002mm. 2 each of 8x10mm, 15mm, 20mm, 25mm, 30mm, 35mm and 40mm. Length 100mm. Supplied in sturdy wooden box.