The standard slotted head is very best utilized having a flat screwdriver, whilst the cross-shaped indention is most effective suited to the Phillips screwdriver. A Robertson screw contains a sq.-shaped indention and requires a matching driver head. The duration of those screws varies, but most drywall screws have flat heads https://wood53085.bligblogging.com/29065792/5-essential-elements-for-screws