Combi screws are merely because the title implies: a mix of two screw heads on 1. there are actually a number of types of combi screws, all of which may be utilised with one or more drivers. The purpose of a combi screw https://rafaelezww033073.answerblogs.com/28319185/how-much-you-need-to-expect-you-ll-pay-for-a-good-types-of-screw-heads