These versatile Kreg Trak Clamps (KMS7520) fit the Kreg Clamp Trak, Universal Clamp Trak Kits, and Mini Trak. They can be easily mounted to the Kreg Accu-Cut track and Starting Block when clamping is needed. These easy-to-use clamps lock into place on the underside of the Accu-Cut Track and Starting Block. When you're working with materials such as melamine-coated particleboard, or when you're cutting with a single length of track, these clamps offer the additional holding power that you need.