PBC Linear SRM30PD 0600 SL Pre Drilled Linear Shaft Support Rail, Aluminum, 30 mm Shaft Dia, 600 mm Lg G1579435 (2) 1 3 8 in HCS Wood (2) 1 3 8 in HCS Wood Blades re closable box perfect for spaces ranging from small office cubicles to large copy centers and weighs only 25 pounds Material Aluminum Mounting Hole Center to Center 200 mm Finish Unfinished For Use With Linear Shafting Shaft Material Carbon Steel Product Type Linear Support Rail Shaft Material Grade 1060 Standards ISO System of Measurement Metric Support Rail Material Aluminum Support Rail Drilling Pre Drilled Mounting Surface to Shaft Center 53 mm Mounting Hole Type Threaded Series SRMPD Profile Type Standard Profile Mounting Hole Center to Shaft End 100 mm Surface Hardness Minimum 60 HRC Rail End to Hole 100 mm Country of Origin United States Mounting Hole Size 10 mm