Universal Brass Antique Grandfather Winding Clock Key (Odd) 5 Way Brass Clock Winding Key Odd Numbers (3, 5, 7, 9, 11) (3) 3mm, 1/8n (5) 3.5mm, 9/64n (7) 4mm, 5/32n (9) 4.5mm, 0.174n (11) 5mm, 13/64n Made in India Material: Brass