GRK's R4™ self-countersinking screw has a patented underhead with saw-blade like cutting teeth and six self-contained cutting pockets. Together they act similar to a circular saw-blade, transporting the drill dust away from the edge of the screw hole while cutting a perfectly clean hole into even the most brittle materials without cracking any surface treatment. This design enhances the R4™’s versatility by allowing the fastener to countersink into even the hardest woods. The screw head closes the hole off with precision, leaving no damaged fibers around the head.
|Stock code||Upc code||Size||Pieces||Weight (lbs)|
|000077269113221||772691 13221 5||5/16X3"1/8||1card=1bit+15screws||0.56|
|000077269113225||772691 13225 3||5/16X4"||1card=1bit+12screws||0.54|
|000077269113231||772691 13231 4||5/16X5"1/8||1card=1bit+10screws||0.55|
|000077269113235||772691 13235 2||5/16X6"||1card=1bit+10screws||0.54|
|000077269113287||772691 13287 1||3/8X8"||1card=1bit+3screws||0.31|