Overview Product Description Bore hardwood, softwood, plywood and drywallForged and heat treated for long lifeFor use in 1/4-Inch (6.4 mm) or larger power drillsHole in top center of bit for wire pullingCan be used with extensions for longer length Product Videos Custom Field Product Reviews Write a Review Write a Review × Greenlee 33A-3/8 Wood Boring Spade Bits - zip bit 3/8" Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *