Sliding Door Flush Latch.Description: Hook type sliding door lock，Black finish. Material: Diecast Steel. Type: Keyed,Flush Mount. This handle set fits all popular flush lock punch-outs using a 6-5/8 in. hole center spacing, and it is used to replace damaged or missing flush mounted, hook style handle sets on sliding glass doors ranging from 1 in. to 1-1/8 in. for left or right-handed sliding glass doors. only works with hook style door handles. sliding security door lock works on most vinyl, aluminum, or wood sliding doors.