Barton Size 3 45mm Plain Bearing Pulley Block Single Swivel Becket [N03131] Marine Hardware | Chocks Using the built-in GPS receiver

Using the built-in GPS receiver

The convex mirror provides a wide viewing angle and the precision-machined bracket provides a rigid lock for superior stability in rough waters

Take a measurement from the top of your gunnel to the bottom of your trolling motor shaft (right under trolling motor head) when in the STOWED position

All marine antennas are manufactured in the USA with 316 surgical stainless

D (inch) 3 5/32"

Barton Size 3 45mm Plain Bearing Pulley Block Single Swivel Becket [N03131] Marine Hardware | Chocks Using the built-in GPS receiverSize 3 45mm Plain Bearing Pulley Block Single Swivel & Becket The size 3 Barton plain bearing blocks have 45mm (1 3 4" sheave size 3 block range incorporates modern design with stainless steel frames and the latest advanced materials, using 30% fibre glass filled nylon and Acetal sheaves to maximise their strength whilst keeping weight to a minimum. Suitable for use as mainsheet, vangs, lead blocks, or wherever a powerful and compact purchase system