Pella Casement Sash lock strike came on casements from 4/2000 to current Then made the change to pull the sash in tighter on lock side. Went to model 0DSW0025. This was a Pella change ( not a after market ) Will help with some air infiltration. There are 2 settings. Pella Casement Lock Adjustment Strike (KEEPER) ELIMINATES DRAFT (Two Per SET)