Summa 60° Tangential Blade 390-550 $53.00 Quantity discounts available QuantityPrice SKU: 390-550 Summa 60 degree tangential knife blades for Summa T series vinyl cutters and plotters. Ship Pickup in Store - FREE! Select Store to check availability. Quantity -+ Add to Cart Print Details Summa tangential knife blades for Summa T series vinyl cutters and plotters. Tangential blades create sharper corners and more precise cuts. Details Back DetailsSumma tangential knife blades for Summa T series vinyl cutters and plotters. Tangential blades create sharper corners and more precise cuts.