ROBERTSON Flat head with Nibs Aster® Lo-Root®

These are wood screws with:

• Flat Head: flat top with a countersunk bearing surface.
• Original Robertson® square drive
• Self Counter-sinking Nibs
• Lo-Root® Thread
• Aster® Thread Feature

Lo-Root® Threading provides a single lead deep thread with a wide spacing for superior holding in softwoods and particle boards. 

Aster® Thread Feature is now standard on all Lo-Root® screws with a serrated tooth thread design, providing quicker starting, reduced splitting and less drive torque.

It is recommend to use only Original Robertson® bits together with Robertson® screws for a true "Cling Fit" that provides maximum recess penetration, holding power and driving performance.

• Original Robertson® Fastening System
• With true "Cling Fit" in maximum recess
• Aster® serrated teeth on all Lo-Root Deep Threads provide greatest holding strength in soft woods and particle boards
• Sharp thread angles and points offer excellent penetration and engagement
• Self-countersinking nibs under the head

All Screws under 1" are fully threaded. Screws over 1" are 2/3 threaded to help prevent "jacking" when two materials are fastened together.