Premium brown premium plastic plugs made from high density polyethylene material (HDPE) to fit screw diameter 4.8, 5.5, 6.3mm. This pack also comes with 400 twin-threaded woodscrews (10 x 2" / 5.0 x 50mm) plus a pack of 5 PZ2 V5 impact bits and 1 Masonry Drill Bit. NOTE: It may be beneficial to reduce drill diameter in soft materials.