The Marshalltown Control Joint Walking Groover is a lightweight tool that comes with a large, red-tipped sight to help you create straight joints in wet slabs. Choose your ideal blade length. All blades are made from a durable aluminum and have a radius of ¼” and a groove depth of 1 ½”. Great Walking Groover for functional and decorative concrete work Blade material: lightweight aluminum Choose your ideal blade length Comes with a red-tipped sight for added accuracy when grooving Use with a Part #9 or #10 clevis handle, sold separately