5" Stainless steel shank with 1/4" bore.
The maximum thickness these can be used at is 3 5/8". This is from the back of the plastic collar to the shank nut.
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Great product, great price
My keezer collar is 1x10 oak board outside, then 2x8 pine board, then 1” foam board insulation inside. Total thickness is 3”. This shank was perfect fit with enough thread to attach compression nut fitting for beer tubing. Great product at a great price.