Sailboat thru-deck double block (max. rope ø : 8 mm)
289 Harken

Low-friction Bullet blocks lead control lines aft. They are compact and lightweight, with fast trim and release under high or low loads. A range of styles lets these blocks adapt to almost all control line applications.
Delrin® ball bearings, sheave, and sideplates are UV stabilized with carbon black for maximum protection.
Wire Bullet blocks use roller bearings to carry higher loads and feature Hardkote-anodized Teflon® impregnated aluminum sheaves for strength and corrosion resistance. Mast exit blocks with cams used for halyard controls and under boom mainsheets.
Pivoting exit blocks with cams are often used for halyard controls and as "head knockers" for sheeting directly from the boom. The 140 has a high safe working load and is designed for spar-mounted halyards and control lines. The 141 is also ideal for control lines.