• C-36 w/in-mast furling (section F560-E) and collar A8286 (Charleston Spars)
• C-42 w/in-mast furling (section F760-E) and collar A8286 (Charleston Spars)
• C-42 w/non-furling mast (section F740) and collar A8286 (Charleston Spars)

• Thread: 8mm
• Pin diameter (large): 9/16" (~ 14mm), length: 1" (~25.5mm)
• Pin diameter (small): ~0.47" (~12mm), length: ~5/8"(16.5mm)
• Hole diameter, for block, is drilled for 5/16" pin
• Overall height: ~2"
• Nut, measured flat to flat, or required width of opening in base of collar: 9/16" (~14mm)
• Nut, height, or required height of opening in base of collar: 1/4" (~5 mm)