Designed to give extra positive or negative trim. 1/2" x 4" x 11-1/4". Used as an aid for boats with an insufficient transom angle or for boats having planing problems at low speedUnique design of the CMC Transom Wedges allows you to also use them as set back spacers, simply stack and invert 2, 4, and 6 setsFit all Transom jacks, jack plates, Outboard lifts, tilt trim units, and outboard motors with a standard B.I.A bolt patternMade of strong 6061 T6 alloy aluminum (not cast aluminum)