Elesa+Ganter TTB. Bearing heads Material Glass-fibre reinforced polyamide based (PA) technopolymer. Resistant to solvents, oils, greases and other chemical agents. Colour Black, matte finish. Standard executions - TTB-A: zinc-plated steel M10 screw, nut and washer. - TTB-SST: AISI 304 stainless steel M10 screw, nut and washer.