02-31251 and 02-31251U for door thickness 7/8" - 1-9/16"
02-31252 and 02-31252U for door thickness 1-5/8" - 2-1/8"
Only B3, B15, B26D and 716 knockers are available with viewer. B3 is furnished with B4 (606) viewer, 716 is furnished with B10B viewer, B15 (619) is furnished with a 636 viewer