Crain 518 Stair ClawStair Claw provides a simple way to stretch carpet across the stair tread and form it around the stair nosing. Hook the gripper teeth in the carpet just ahead of the stair nosing, then pull the leverage handle down. A pulling action is generated on the teeth that stretch the carpet across the stair tread. At the same time, the bottom edge of the stair claw tucks the carpet up under the stair nosing. Recesses in the bottom edge allow the nose of the