Set of seven pairs of steel parallels, made from high grade alloy steel, case hardened to 58-62 HRC, ground on all four sides in matched pairs. Indispensible for setting up on mill, surface grinders, shapers as well as for inspection and layout work. Total parallelism over 150mm is 0.002mm. Supplied in a storage case. Sizes available within set are 3mm x 10mm, 3mm x 12mm, 4mm x 14mm, 6mm x 18mm, 6mm x 24mm, 8mm x 30mm and 8mm x 38mm. Overall length 95mm.