For patio construction, the screws should be countersunk to be evenly flush with the decking. The 881/4/1 bit holder with variable screw depth limitation and felt ring allows for a uniform depth and protects the surface from brush marks. Two spare felt rings included.

Bit holder for evenly flush countersunk screws in patio construction
With adjustable screw depth limitation
Felt ring (exchangeable) prevents brush marks on decking
Included: 2 spare felt rings

1x 881/4/1 SB Bit holder with variable screw depth limitation, 3 pieces

Bit holder for evenly flush countersunk screws in patio construction
With adjustable screw depth limitation
Felt ring (exchangeable) prevents brush marks on decking
Included: 2 spare felt rings