Packaged in a plastic bag of 100 pins. For traction on asphalt, concrete or rocky terrain. Hole is drilled with 4.5mm drill bit. 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 Drill Bit.