Check the listing for details. Acroloc Tool Holder Lot Of 17. Condition: Used. Listed at 478.11 USD. Acroloc Tool Holder Lot Of 17. One of them in marked on Sharpie on the back that it needs something, cant tell if the second word is work or something else. There are nutted topped ones with nuts from TSD and Universal Engineering Acura-Flex with tapered internal shafts on the front face of the collet or mount plate.I took appprox measurements of front and backplate holes somewhat accurate because the backplate hole cannot be reached with my inside micrometer and the front holes are tapered for the most part. Mix of cone nosed shorter chucks and chucks with a longer extension with nuts and or a couple have some spring loaded shaft that you can pull out by hand but it retracts back into the chuck once released. Rough approx measurements in inches as follows: Short cone nosed front 0.75 back 0.70 marked needs something on the back plate, long tube nutted top spring loaded front 1.10 back 0.70, nutted long tube nose front 1.10 back 0.90, nutted long tube nose front 1.10 back 0.90, nutted long tube nose front 1.10 back 0.90, jacobs chuck front no hole in backplate, little chuck 3" diameter 1.10 front, nutted front long nose with a collet attached front 0.51 back 0.44, nutted front long nose with collet attached front 0.51 back 0.44, nutted long nose front with collet attached front 0.51 back 0.44, nutted long nose front 0.51 back 0.41, nutted long nose front 0.51 back 0.44, short cone nose front 0.40 back 0.40, short cone nose front 0.40 back 0.40, long tube nose nutted front 0.70 back 0.70, short cone nose front 0.50 back 0.50, long spring loaded tube nutted nose front 0.70 back 0.70 and a short cone nose front 0.13 and back 0.13. As I said these measurements are approx not entirely precise in other words. Note these will ship in 4 USPS priority flat rate large boxes. See photos below for further condition details.