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3-1/2 in Deck Baluster Spacing Gauge
This is a hook-on spacer block for building deck railings. It is exactly 89 mm (3-1/2 in) wide, so every gap comes out the same and stays under the common 4 in sphere rule. The 25 mm lip hooks over the top of the rail, so the block hangs between face-mounted balusters while you screw the next one in. It is a ribbed open frame (89 x 110 x 20 mm body) with a finger hole for pulling it back out.
2x2 Deck Baluster Repair Shoe
A screw-down socket shoe that re-secures a loose or rot-damaged 2x2 wood deck baluster (1-1/2 in = 38 mm square) to the top of a 2x4 bottom rail or tread without tearing out the railing section. It has a 39 mm square cup 22 mm deep, drain notches so water can't pool, #6 cross-screw holes (4.0 mm) through both wall pairs, and a 92 x 47 mm gusseted flange with four counterbored 4.8 mm holes for #8 or #10 deck screws.