Allen Single 40mm TII ON Block Ai_Description It becomes waterproof once applied

It becomes waterproof once applied to the skin

Internal silicone grippers ensure the PFD stays in place during movement

toe and bridge support allow the flexibility needed to remain agile

specifically the forestay

638 Cut Out Size  244 mm Cover Width  288 mm Opening Size  223 mm / 9 " Fixing Hole Size  4 mm Weight  223 g

Allen Single 40mm TII ON Block Ai_Description It becomes waterproof once appliedThe 40mm single tii on block is our go to dinghy mainsheet block. Also ideal for dinghy jib and spinnaker sheeting systems as well as keelboat control lines. Our Tii On blocks feature a stainless steel loop at the head of the block. This gives our Tii On range maximum strength and reliability with minimal cheek separation when tied on and loaded up with a soft shackle. The stainless steel head loop also ensures the block stays in the right orientation