Woodys Steel Stud Sharpening Tool - 30 deg. TOOL-SHARP3 Easy to use just put the tool into a 3/8in. drill chuck and sharpen studs while they are on the sled Available in 30 deg., 45 deg. and 60 deg. angles Replacement sharpening inserts also available; sold separately Replacement inserts fit 30 deg., 45 deg. and 60 deg. sharpening tools and come in a four-pack