CT™ Economy Knee Boots, Steel Toe, Size 10, 16 in H, PVC, Black ORS NASCO Evolution standard geometry is sufficient Evolution standard geometry is sufficient for most drilling applications Manufactured specifically to maximize hole accuracy while minimizing cutter vibration and extending annular cutter life Using this standard geometry enhances accuracy and saves time This allows for a single ejection of slugs when drilling through stacked material Wide opening jaws provide greater versatility Swivel pads hold tapered work PVC injection molded footwear is 100% waterproof to ensure workers' feet are dry and comfortable PVC formulation is resistant to degradation from agricultural chemicals fertilizers and animal waste Flexible and durable upper allows for ease in movement for greater work comfort Removable FOOT FORM™ contour cushion insoles provide all day comfort and support Reinforced construction at critical stress points provides a durable and long wearing boot