Disston Screwdiggers fulfil the same function as Screwsinks but the countersinking part can be slid up and down the drill part of the tool.
This means, for example, that a No.
8 Screwdigger can be adjusted to predrill for different lengths of No.
8 Screw.
This set contains 1 each No.
6,8,10 & 12 screwdiggers.
Additional Information:• Type: Screwsink• Screw Compatibility: Set