Amana Tool 49646 BEAD RAIL CUTTER 1/4 SHANK Router BitOur Profile Cutters are a unique and versatile series that can be used for general profile routing, glass doors andwindows, as well as stile and rail work. (The panel groove and stub tenon must be cut separately.) The inverted handcutters will produce copes that nest perfectly into the profiles cut by the matching 'regular" bits. In addition, theinverted head allows you to profile edges that are out of the reach of regular profile bits. These 1/4" shank bits will fitany router. All are equipped with ball bearing guides, either on the tip or on the shank.