System A Battcar Track & Accessories Track is extruded from high-grade 6061-T6 aluminum and Hardkote-anodized for a hard, long-lasting surface. 3807 track mounts to mast using a unique slug system that allows mast-up installation. For masts without internal sail track, attach 2720 Small Boat traveler track by drilling and tapping the spar. Join track sections with splice links. Order one per track section. Order one low-beam endstop (sold in pairs). See chart below. Mounting Kits and Endstops Mounting kit includes slugs, fasteners, Loctite® and a connector slug. Slugs are available for flat or round mast grooves. Order one kit per track section. Use screwpin endstop to easily remove cars and mainsail. Screwpin endstop kit includes track end with screwpin endstop, fasteners, Loctite® and slugs. Fixed endstop kit includes fasteners, Loctite®, slugs and a pair of 263 endstops. Order one kit only.