Coupler,18K 2-5/16" Adjustable Demco (140194)

Demco adjustable height 2 5/16" coupler is rated at 18k when used with two bolts passed through the mounting holes and 21k when used with 4 short bolts to fasten it to the channel. Hitch says use 4 5/8" Grade 5 Bolts(not included)