The Multi-Use 4-Cornered Rib has 3 sides with multiple different angles for finishing and creating feet. The beveled edges make it easier for the tool to glide along the clay without catching or creating friction. The smoother design makes surfaces more stable and helps the clay hold its form on the edges of the pot. The 90 degree corner is a great replacement for trimming and cleaning. The sloping backside, or rump, is great for shaping the outer surfaces of your piece and giving them a hidden foot look and flat edges.