ITEM NAME:M4 x 38mm HEAVY DUTY METAL PLASTERBOARD CAVITY WALL FIXINGS ANCHORS PLUGS ( W1K4 M4 x 38mm HEAVY DUTY METAL PLASTERBOARD CAVITY WALL FIXINGS ANCHORS PLUGS ( W1K4 Used to fix items where there is a cavity behind the surface. Strengthened anchor wings gives maximum load capacity. Bonded washer with integral thread for increased reliability. Combination head on the screw to accept both slot and cross-recess screw drivers. Color: picture color material: metal Size: M4*38mm Package Contents: 20*Expansion bolt Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.