Low-profile mastbase halyard lead blocks are lightweight and can be grouped in a small area at the mastbase.

• Sheave Ø (mm): 44 mm
• Sheave Ø (in): 1 3/4 in
• Length (mm): 73 mm
• Length (in): 2 7/8 in
• Width (mm): 22 mm
• Width (in): 7/8 in
• Height (mm): 57 mm
• Height (in): 2 1/4 in
• Weight (g): 95 g
• Weight (oz): 3.36 oz
• Maximum line Ø (mm): 10 mm
• Maximum line Ø (in): 3/8 in
• Number of fasteners: 2 
• Fasteners (mm): 6 RH mm
• Fasteners (in): 1/4 RH in
• Maximum working load (kg): 340 kg
• Maximum working load (lb): 750 lb
• Breaking load (lb): 1500 lb
• Breaking load (kg): 680 kg