It is made by by punching machine. The fixing socket is made of carbon steel or stainless steel.zinc plated. It can be used in concrete by fixing bolt or anchor bolt,etc. ItemCode Dimensions PackingPcs. M12x60 12 20 60 10 500 M14x85 14 35 85 10 500 M16x75 16 22 75 13 500 M18x100 18 35 100 13 250 M20x90 20 25 90 16 250 M24x120 24 45 120 16 250 M30x100 30 30 10 18 100 M36x135 36 35 135 22.5 100 ItemCode Thread Sized PackingKg Ttl LengthHmm HoleDiagmm packingPcs. M8x4 M8 200 40 6.2 500 M8x50 M8 250 50 6.2 500 M10x50 M10 350 50 6.2 500 M12x60 M12 500 60 7.2 400 M12x70 M12 600 70 7.2 400 M16x70 M16 600 70 9.2 200 M16x80 M16 700 80 12.2 200 M16x100 M16 800 100 9.2 100 M16x120 M16 1000 120 12.2 100 M20x100 M20 1200 100 12.2 100 M20x120 M20 1400 120 14.2 100 M24x120 M24 1800 120 14.2 50 ItemCode PackingKg Thread Sized Size PackingPcs. M6x40 150 M6 25 40 6 2000 M8x50 250 M8 30 50 8 1000 M10x45 325 M10 25 45 10 500 M10x60 400 M10 30 60 10 500 M12x60 400 M12 30 60 12 400 M12x70 600 M12 40 70 12 400 M16x100 1000 M16 50 100 16 100 M20x100 1250 M20 50 100 20 100 M24x100 1600 M24 40 100 24 50