This is our very latest and most comprehensive Pro Cartridge Mounting Kit which comes complete with tools. To extract the ultimate performance from your cartridge it is imperative it is correctly mounted to the headshell. This can only be done with bolts of the correct diameter, length, strength and material. Using inferior fixings such as aluminium, brass or nylon will result in audible loss of information. The mounting bolts and nuts in this kit are non magnetic high strength stainless steel - the only type you should use when fitting a cartridge. The socket head on the bolts allows for easy tightening with the supplied allen key, and the British made miniature combination spanner provides a much safer and easier way to secure the nut than pliers. Incidentally, both ends of the spanner are the same size, so you can use either the closed or open end. The size of the supplied bolts has been carefully chosen - the 6, 8, 10 & 12mm bolts will be perfect for the majority of cartridges on the market. The 16 & 20mm bolts are provided for those really deep bodied cartridges, like some Audio-Technica Moving Coils. You should always use the shortest bolts that will accommodate your cartridge as bolts that are too long add unnecessary mass. We had been aware that certain tonearms (notably some Thorens models) would not accept these industry standard sized bolts, but we were unable to source high quality smaller M2 fixings. We have now, though, and the most popular sizes (10mm & 16mm) are included in the kit. Please note that the spanner included will only fit the larger bolts, so if you use the smaller bolts / nuts you must use a pair of miniature pliers to tighten them. The 43 piece kit comprises: 2 x M2.5 x 6mm stainless steel allen bolts 2 x M2.5 x 8mm stainless steel allen bolts 2 x M2.5 x 10mm stainless steel allen bolts 2 x M2.5 x 12mm stainless steel allen bolts 2 x M2.5 x 16mm stainless steel allen bolts 2 x M2.5 x 20mm stainless steel allen bolts 2 x M2 x 10mm stainless steel allen bolts 2 x M2 x 16mm stainless steel allen bolts 8 x M2.5 stainless steel nuts 8 x M2.5 stainless steel washers 4 x M2 stainless steel nuts 4 x M2 stainless steel washers 1 x 2mm Allen wrench 1 x 1.5mm Allen wrench 1 x Miniature Combination Spanner