PRO-LOK | sku: 3565190 Pro-Lok 3-1/2 In. Adaptor Plate Helps to cover up wood damage, re-size holes and reinforce locking systems Reduces bore from 3-1/2? in. down to 2-1/8? in. Allows for use on all door locks from standard residential to commercial quality For use with Mortise Deadbolt and Rim Cylinders... Log in for pricing