1/4" Male to 1/4" Male Threaded Tripod Screw Adapter Double Sided Standard Mounting Thread Converter for Camera Cage Mount Avatar(2 Pack) : Amazon.co.uk: Electronics & Photo
M6 x 41mm Extended Double Ended Threaded Bars (DIN 938) - A4 Stainless Steel: Accu.co.uk: Precision Screws