Face frame screws are made specifically for pocket hole jig work in softwoods. The #6 and #7 gauge screws are produced with a uniquely shaped #8 gauge diameter head to reduce the head from embedding itself in the pocket or placing undue pressure in the pocket, reducing the risk of splitting. They feature a deep fine thread for maximum grip and a self drilling tip to ease driving while reducing the risk of splitting.
The standard finish is "Lube" which has a bronze/Grey colour. The colour of the screw comes from the heat treatment after which a dry wax is applied to prevent corrosion and ease driving.
Origin of the Robertson square drive screws
The "Robertson" screws were invented in Canada by Peter Robertson in 1908. Due to patent restrictions they stayed in Canada for many years and became the standard screw in that country. They are now spreading rapidly through the US and other countries. It is a far superior system and we are sure you will agree “once you use them you don't want to use anything else”.
Not only is the drive system better than the conventional drives, the actual quality of the screws is superb. The screws are extremely strong and the square drive means the driver doesn't jump out and the screw does not break under heavy load.