Nayland 20 in. W Wall Mount Glass Shelf in Matte Black Color Finish:Oil Rubbed Bronze Quick Shift Mode is an automatic Quick Shift Mode is an automatic electronic controller that downshifts and reduces rotation and impact speed prior to driving the screw into place 20x faster than conventional spade bits 10x more holes than conventional spade bits Spyder stinger(TM) automatically engages the work surface for no thrust drilling Unlike other spade bits with a self feeding thread point L x 5 1 2 in 00 Shelf Features Concealed Hardware Returnable 180 Day Shape Oval Shelf Included Components Mounting Hardware Product Depth (in