Made from synthetic plastic. Safe to use on precious metals such as gold and silver. Holds watches and bracelets firmly in places while adjusting, removing, or repairing pins and links. Set includes (1) 2" x 2" plastic block; watch is for photo reference purposes only.

7 Slot Sizes:

.137" - 3.5 mm.

.157" - 4.0 mm

.177" - 4.5 mm.

.196" - 5.0 mm.

.236" - 6.0 mm

.255" - 6.5 mm.

.275" - 7.0 mm.