Well Drilling Accessories For A Portable Well Drilling Rig: (3) Drilling Collars- used to place weight on the drill bit to optimize drilling performance, two collars are 5' long & one is 20" long, all three collars use 1-1/4" NPT connections. (1) used 3" diameter rock coring bit. (1) unused 3-1/2" diameter three wing drill bit. (1) used 3-7/8" four wing drill bit with tungsten cutting elements. (9) used diamond coring bits for drilling into rock, three 3" O.D., one 2-7/8" O.D., one 2-5/8" O.D., four 2-1/8" O.D. (2) Used rock drilling bits with tungsten buttons, one 3" diameter & one 2-7/8" diameter. (5) unused suction strainers, two 6" diameter & three 7" diameter. I sold my drill rig, the parts I have listed are the only drilling parts that I have for sale. If you are planning to drill a well yourself the accessories will work on a portable drill rig. I AM NOT IN THE WELL DRILLING BUSINESS - I DON'T DRILL WELLS. If you have well drilling questions or are looking for someone to drill a well for you call a professional well driller. The parts listed were purchased as a drilling kit to drill into rock, I am selling all the parts listed for $1,250., I will not sell the parts separately, no haggle price, call's only please.