Size reinforcing bars commonly used.

Size and number of reinforcing bars.
Pile size (cm.)	Iron stand		Steel casing.
	size	Number (lines).	size	Distance (m).
35	DB 12	6	RB 6	0.20
40	DB 12	8	RB 6	0.20
50	DB 16	6	RB 6	0.20
60	DB 16	8	RB 6	0.20