Rocket Sinkers, also called Bomb Sinkers, sink fast and are ideal for bottom fishing deep water with paternoster (dropper) rigs. The round, wide, bulbous base thins towards the top where a brass swivel is fitted as an attachment point. You can attach, remove or change your sinker easily using a loop knot tied at the end of your line - simply thread the loop through the eye of the swivel, then push the sinker through the loop and tighten the line, so the loop wraps around the swivel eye. Reverse that process for quick sinker removal. Some anglers use rocket sinkers running along the main line between hook and swivel, or two swivels or rings.