HI THERE,CUSTOM TATTOO MACHINE STEEL FRONT AND REAR BINDER SET WITH MATCHING CONTACT SCREW,CONTACT SCREW AND REAR BINDER SCREW ARE M3 AND MAIN SCREW FOR FRONT BINDER IS M4.CAN BE USED FOR LINERS AND SHADERS ALIKE.PLEASE HAVE A LOOK AT MY OTHER CUSTOM TATTOO MACHINE PARTS,IF I DONT HAVE WHAT YOU WANT THEN PLEASE MESSAGE ME AND I WILL DO MY UPMOST TO GET IT FOR YOU.ALL MY ITEMS POSTED ROYAL MAIL.THANKS FOR LOOKING