Steel ball : 14MM(ball diameter) *M5(threaded)*10
13MM(ball diameter)*M5(threaded)*10
12MM(ball diameter)*M4(threaded)*15
15MM(ball diameter)*M4(threaded)*15
Attention:We have 12mm,13mm,14mm,15mm, when you place order,please leave message to us what size you need,or we will send 14mm to you.