You will discover much more than 10 screwdriver slot configurations. DIYers only will need to bother with 5, because the rest are for specialty trades. Slotted and flat generate heads are applied on applications that don't require just as much torque as instruments can certainly slip from spot. Countersink is https://types-of-decking97394.blogozz.com/28902487/types-of-screw-heads-with-pictures-for-dummies