The standard option for ALX170 is surface mount which will work on door thicknesses down to 1-3/8".
With the thru-bolt option kit, the standard door range of 1-3/8" through 1-7/8" is supported. The thru bolt is 3" long but has clearance within the assembly on the opposite side to tighten as far as possible even on a 1-3/8" door.
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