Used to Pre-drill and countersink stainless steel screws when installing decking.
Overall Length:
SMART-BIT® makes a hole 1-1/8" deep, including the depth of the countersink. It is general practice not to pre-drill the underlying (joist) material, as this is usually treated lumber and does not require pre-drilling. SMART-BIT® provides sufficient depth for installing deck lumber up to 5/4" nominal size.
Specifications:
| Size |
Drill Bit Diameter |
Countersink Diameter |
Countersink Angle |
| mm |
inch equiv |
mm |
inch equiv |
| #7 Trim |
3.0 |
7/64 |
6.2 |
1/4 |
60 degrees |
| #8 Trim |
3.2 |
1/8 |
6.6 |
17/64 |
60 degrees |
Fastener Compatibility
The three sizes of SMART-BIT® are designed to work with the three principal stainless steel deck screw sizes: #7 trim head, #8 trim head and #10 flat head.