Diamond saw blade comes in blank blade("core") and segment. Different welding technology uses different types of cores. For high-frequency welding blade, the material of the core is 45Mn steel. For laser welding blade, the material of the core is 28CrMo/30CrMo steel. There are some different types of slots to suit different materials, and please check the details as follows: For diamond concrete cutting blades, the slot type is usually a "Key Type". When cutting concrete or reinforced concrete, this type of slot will disperse the stress effectively and protect the core at the same time. Sunny Superhard Tools offers you high-quality concrete cutting blade for a circular saw, angle grinder, and other cutters. The fast cutting and long duration of our concrete blade win lots of customers around the world. The 350mm concrete cutting blade on this page is a high-frequency welding blade for cutting concrete. The arbor is 25.4mm, and there is a location hole next to it. It is designed to be used on the concrete saw and concrete cutters. High quality of the diamond is used to ensure its top performance. 350mm diamond saw blade for cutting concrete. Excellent diamond segment formula for fast & smooth cutting. "Key slot" can protect the core from damage. Good packing and fast delivery. OEM/ODM service is available. SAFETY TIPS:  Whenever you are using a diamond saw blade for cutting projects, for keeping safety, please be careful and make sure that your body is fully protected. Safety is the first thing you should concern when doing cutting works.  φ350*40*3.2*10*24T