The common slotted head is finest used using a flat screwdriver, even though the cross-formed indention is best suited to some Phillips screwdriver. A Robertson screw incorporates a sq.-formed indention and demands a matching driver head. Elevator bolts are Employed in a wide range of apps. These bolts can, for https://screws08630.smblogsites.com/28646951/facts-about-screws-revealed