ZERO CLEARANCE INSERT FOR BOSCH GCM12SD MEDIUM DENSITY MDF SET SCREWS NOT INCLUDED DESIGNED FOR USE WITH THE OLDER AND NEWER VERSIONS OF THE GCM12SD Zero-Clearance Insert Compatible with Bosch 12" Sliding Miter Saw model GCM12SD. It helps to reduce tear-out and eliminates thin cut-offs from being pulled under the factory insert. Made from medium density MDF, painted side red. Set screws are not included. The inserts do not have blade cutouts so you can cut the desired width for your preferred blade after installation.