Thread Model Package Type Gauge Length Length USP L-type 19G 100mm 155mm 0 L-type 21G 60mm 115mm 2/0 Cannula L 20EA L-type 21G 90mm 145mm 2/0 L-type 23G 60mm 115mm 3/0 Cannula W W-type 19G 100mm 155mm 1 20EA 4