Includes a pack of 100 Personna carpet trimmer blades. They are for use in popular carpet wall trimmers including Crain No. 245 and No. 246. These blades are bevel ground on the top surface only to prevent the trimmer from rising and producing a fuller cut than desired. Install in the trimmer with the bevel side up. These blades produce an accurate height of cut which results in easier tucking of the carpet in the gully behind the tack strip. These blades are individually wrapped in paper and come in a laminated paper box. Blade dimensions: length: 2.18, width: .75, thickness: .017.