These Dormer 2 piece sets each feature a tap and its corresponding pre-hole drill in one convenient package, helping to save time and error.The packs contain an A002 split-point jobber drill and a choice of popular tap: E000 HSS-E spiral point or E002 HSS-E spiral flute. The taps are suitable for threading up to 2.5x their diameter in most materials (ISO Standard). Spiral point taps are used for through fitting, fluted taps are used for flat fitting/bottoming.Specifications: Type: Spiral PointThread Size: M4