Kwikset 81706 2-1/4" Thick Door Installation Kit for all Kwikset and Signature Series Knob and Lever Styles: CN, C, LL, TNL, P, T, V, DL, DNL, ADD, AVC, ADC, CHC, BRL, AND PML For Signatures Knobs use 81714 Necessary to install on doors 1-7/8" to 2-1/4"…