PRACTICAL TOOL SET - These saw attachments can meet most of your needs, different specifications provide you with quick cut, medium cut, smoothly cut, fine cut and ultra fine cut. WIDELY COMPATIBLE - U shank with hole allows the saw compatible with most jig saws, such as for Bosch, etc. FEATURES - Pack of 14 replacement jigsaw attachments. Contains both metal cutting and wood/plastic cutting . Metal cutting attachments made from cobalt steel. Wood/plastic cutting attachments made from high alloy steel. Includes handy storage case. CONVINIENT DESIGN - U shaped handle design provides maximum grip and stability, and no need to set screws in the mounting holes to reduce breakage. STRONG QUALITY - These attachments are made of high carbon steel material with high hardness and good wear resistance, for straight, and fast cuts.