Packaged in a plastic tube of 100 pins. For traction on asphalt, concrete or rocky terrain. Hole is drilled with either a 4.5mm or #17 drill bit, both are included. Pin is driven in to desired depth. Pin is tapered so it tightens as it is driven Dimensions: 4.5 - 5.1 mm (tapered) x 9 mm long. NOTE: Packaging includes 1 - 4.5mm and 1 #17 Drill Bit.