H19 H22 and H25 Hexagonal Hollow Drill steel rod with 55SiMnMo material.







Mostly we use the H22 hollow drill to produce H22-108mm taper drill rod as you can see in the above pictures. 
and Some customers also need H19-108mm or H25-159mm taper drill rod or integral drill steel for YT24 or YT28 jack hammer rock drill rig. 

Kong Kong Drills Limited is not a professional manufacturer which produce rock drilling tools, we also provide all series solutions for our customers. 
we have selled over 800tons 55SiMnMo Hollow Drill steel rod to our customers last year, we have provide over 50pcs solutions for our customers who can not get any suggestions or helps from Other Companies especially bought from China. 

I am always waiting here for your inquiry.

Contact me:Bruce Lee
Email:brucekingkongdrills@gmail.com    bruce@kingkongdrillsltd.com  Whatsapp/Phone:+86 176 3857 1343