Discover the Alpha® Groove Cutter, a game - changer in joint seaming. It's engineered to cut perfect grooves, ensuring each joint reaches maximum strength with its patent - pending level groove design. You can pick from two sizes to fit your material thickness. This cutter works great with popular high - speed angle grinders on the market. Alpha® also offers a universal safety guard with a water - feed and a Ground Fault Circuit Interrupter as ideal accessories. Upgrade your joint seaming quality and productivity with the Alpha® Groove Cutter. It requires a Universal Safety Guard Kit, is perfect for granite and engineered stone, and is specially made for 1 - 1/4' (3cm) countertops. It creates the strongest joint seams and offers consistent performance with easy operation. Here are the product details:
Part No. | Thickness | Maximum RPM | Arbor(s) | Shape | Recommended For | For Use On |
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GCW258 | 4.2mm | 14,500 | 5/8'-11 Threaded | | 3/4' Slab | Granite |
GCW358 | 7.5mm | 14,500 | 5/8'-11 Threaded | | 1 - 1/4' Slab | Granite |
MCW258 | 4.6mm | 14,500 | 5/8'-11 Threaded | | 3/4' Slab | Marble |
GCWKIT | | | Universal Safety Guard Kit | | | |
PFBNG01 | | - | Nylon Guide | - | - | - |


Using the Alpha Groove Cutter is quite straightforward. First, make sure you have the Universal Safety Guard Kit installed as it's required for safe operation. Choose the right part number based on your material thickness and the type of stone you're working with, like granite or marble. Attach the cutter to a popular high - speed angle grinder on the market. Start cutting grooves for joint seaming slowly to ensure a level and accurate cut. Remember, the cutter is designed to give you a strong joint seam. When it comes to maintenance, after each use, clean the cutter thoroughly to remove any stone debris. Check the cutter regularly for any signs of wear or damage. If you notice any issues, replace the cutter promptly. Also, keep the accessories like the universal safety guard and nylon guide in good condition. Store the cutter in a dry place to prevent rusting or other damage. With proper use and maintenance, your Alpha Groove Cutter will serve you well for a long time.