Lackmond CKVN4375 4-Inch Crack Chaser Wheel with 5/8-11 Nut Manufactured with an inverted "V" shape segment Most commonly used on a 4" and 7" right -angle grinder Designed to prevent further widespread cracking of concrete Fits into a crack nicely and opens up the area with uniform edging so cracks can be filled to prevent further damage to the concrete Most often used dry and thecommonly used blade is of 4" diameter, 375" width , and has a 5/8-11" threaded hub