To needle Large Intestine 4 use an oblique 45-degree insertion to a maximum depth of 1/2 cun.

To needle Spleen 6 use a perpendicular insertion to maximum depth of 1/2 cun.

To needle Bladder 18, use an oblique 45-degree insertion towards the midline. The depth will depend on the physical build of the patient but I never go deeper than 1/2 cun on Bladder channel points on the back.