Specially designed for use on G36 rifle handguards. Precision machined from aircraft aluminum alloy with hard anodized finish for wear resistance. Three 6" Picatinny Rails Each with 13 Numbered Slots 2 Screw Holes on Each Rail Complete with 7 Hex Screws and Allen Wrench Material: Aluminum Weight: 5.6 oz Pieces: 3 Rail Type: Picatinny/Weaver