• Contesub Pretension Guide provides a constraint system for the pre-tensioning of roller rubbers underneath the speargun.
• Designed to provide a smooth and secure anchor point for tensioning lines on your wood, carbon or aluminium speargun.
• Made from premium quality stainless steel.
• Special line guide consists of three parts, a base, a central piece where you will engage the line and a lid with a special adjustable nose that prevents the accidental release of line.
• Fixed on the speargun with a pair of self-tapping stainless steel screws (supplied)
• Alternatively can be fixed into wood using M4 stainless steel screws and threaded inserts M4 (sold separately).

Choice of two sizes - Small and Large - allows running of two parallel lines at different widths.