1 Tefach = 4 fingers' width = 3 ½” (8 cm) to 4" (10 cm)
Lavud = 3 Tefachim = 10 ½” (27 cm) to 12” (30 cm)
1 Ama = 6 Tefachim = 21 ¼” (54 cm) to 24 1/2” (63 cm) (depending on the application)
10 Tefachim = 40” (1 m) (for Shabbat border)