Looks like a standard double-hung window lock but larger in size. Base size: 1-1/16" x 3". Strike size: 5/8" x 3". THIS ITEM IS DISCONTINUED BY IVES. LIMITED TO STOCK ON HAND. CALL FOR AVAILABILITY. MAY WE SUGGEST OUR NO. 18 AS A SUBSTITUTE. See All Double-Hung Window Locks Link to Ives Products Page See a Better but Smaller, Version of this Type of Lock See a Better Version of this Lock.