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uniformly rounded edges $ 3.24
https://brickseek.com/lowes-inven…ku=1058333
https://brickseek.com/lowes-inven…ku=1058333

1/4-inch; cutter length: 1/2-inch; and overall length: 2-3/16-inch $ 3.74
https://www.lowes.com/pd/product/1000625023
https://brickseek.com/lowes-inven…1000625023

1/2 inch $ 4.49
https://www.lowes.com/pd/product/1058323
https://brickseek.com/lowes-inven…ku=1058323