Model A for measurements Ø 3/16” - 1/4” - 5/16” - 3/8” with inclined head
Model B for measurements Ø 3/16” - 1/4” - 5/16” - 3/8” with flat head
Model C for measurements Ø 3/16” - 1/4” - 1/2” - 9/16” with flat head