Great for electric guitar/bass luthiers repair tool. High quality brass material, electroplated finished, bright and shiny, long service life. Help you to in frets on any string instrument. Just place the right insert in the caul. The groove on side to prevent the fingerboard wire from sliding off, and marks on the inserts, easy to identify and use. Pressing frets into a guitar fretboard has the advantage over hammering that the entire fret is pressed in one operation, eliminating the possibility that an end not be seated right, or the hammering could cause the fretwire to deform. Radius of Inserts: 7.25 radians, 9.5 radians, 10 radians, 12 radians, 14 radians, 15 radians, 16 radians, 17 radians, 20 radians Clamp size: 110 x 64 x 14mm / 4.33 x 2.56 x 0.55in Brass Radius Insert Size: 6.3x1.1cm/2.48inch x 0.43inch(LxW) Colour: black + gold Material: brass Package Contents: 1 * Self-leveling fret caul 1 * Hex wrench 9 * Radian Fret Caul Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.