Product Name: High Precision Steel Machinist Parallel Sets Model NO.: 8pairs, 10pairs, 12pairs, 20pairs, 24 pairs, etc Certification: ISO Precision Measuring Device: Precision Measuring Device Accuracy: A Measure Method: Manual Precision: 0.02mm Range: 0?500mm Measurement Object: Parallel Material: High-speed Steel Type: Inspection Surface Plate Size: Inch Size or Metric Size Delivery: One Month Trademark: neutral or OEM Transport Package: Cartons outside Origin: China Product Description Supply precision Steel Parallel Sets with competetive prices.Features:1.Parallel accuracy in height is 0.005mm or 0.0001" .2.Made from high quality alloy steel, hardened and ground.3.Hardened HRC 50 - 55 degree's.4.Size:Metric or Inch5.Supplied in protective plastic box or wooden box.Model No.LengthPcs/setSizes637-7968100mm94x100mm (10 to 42 step by 4mm)637-7964100mm202x(5-20), 3x(6-21),4x(-22), 5x(8-23) , 6x(9-24), all step by 5mm637-7972120mm812, 17, 22, 25, 28, 32,36, 38mm637-7962120mm1210x120mm (14 to 32 by 2mm & 35mm,40mm)637-7967125mm248x(11-36),10x(13-38), 12x(15-40), 14x(17-42), all step by 5mm637-7777150mm78.5x10x150mm, 8.5x15x150mm,8.5x20x150mm, 8.5x24x150mm, 8.5x30x150mm637-7958150mm103x150mm(13mm,16mm,19mm,22mm,25mm,28mm,31mm,35mm,38mm,41mm)637-7959150mm1010x150mm (14 to 32 by 2mm)637-7960150mm1410x150mm (14 to 32 by 2mm & 35 to 50 by 5mm)637-7966150mm248x(11-36),10x(13-38), 12x(15-40), 14x(17-42), all step by 5mm637-7974160mm812, 17, 22, 25, 28, 32,36, 38mm637-7970160mm910 to 42 step by 4mm637-7976200mm817, 22, 25, 28, 32. 36,38, 43mm For more details of our products, please kindly visit our website to browse and download our cataolg.You can also contact us directly through email, fax and phone to get further assistance.