To remove excess filling material within inter-proximal space. Rotate screw 1 to move closer arms of do-all proxicut holder to make the distance between external edges of holder arms equal to the length of saw blade № 1.384 or diamond strip № 1.385. Insert saw blade № 1.384 or diamond strip № 1.385 in clampers 2 of holder's arms and tighten the clampers with key 3.