Mounting brackets for mounting tracks in boats with gunwale built-in tracks. Angle depends upon boat manufacturer. Sold in packs of 2. Heavy duty aluminum bracket with stainless steel screw, washer & T-slot nut. Track must be added. Any length track offered by Traxstech can be used with these brackets, but 18" or longer track recommended for downriggers to spread the weight out. Each hole pattern in the track should have a bracket mounted to it. 6" Track=2 Brackets (1 pack) 12" Track = 3 Brackets (2 packs) 18" Track = 3 Brackets (2 packs) 24" Track = 4 Brackets (2 Packs) 36" Track = 5 Brackets (3 Packs) 48" Track = 5 Brackets (3 Packs) 60" Track = 7 Brackets (4 Packs) 72" Track = 8Brackets (4 Packs). You can gain access to the track slot to slide the t-nut into by removing the back corner boat caps or you may need to cut a way a 1” section of the bottom lip of the track.