Bakelite Guitar Repair Tools: Piano Pillow, Finger, Fret Polishing Tools File Group Kit Diy Accessories Standard shapes are: flat flat, round, semi-circular, square, triangular, pointed flat, knife-shaped, single-sided triangle, the two circles, ellipses. Random delivery Grinding guitar frets, strings bone pillows, bridge, etc. Guitar playing to solve product issues Length: 130mm.