• Overall dimensions: 11-1/4" x 7-7/8"
• Flat area: 9-1/2" x 6-1/4"
• 3" diameter hole in the center to accommodate most electrical wiring installations
• Mast step mounting holes must be drilled to match the holes in your mast step

1) Since you will be mounting this stainless plate under an aluminum mast step, you must use an insulator between the two dissimilar metals. Failure to do so will cause electrolytic corrosion. Purchase the Dielectric Self Adhesive Insulator offered below under "May we also suggest". You will need two sheets for proper coverage.

2) If your boat is equipped with a mid-cabin hatch, it will be necessary to shift the Halyard plate as far forward as possible to avoid interference with the hatch. You need a minimum of 1-1/2" space on deck between the mast step and your mid cabin hatch to use the mast step halyard plate successfully.