Yuyao Ritek Electronics Co.,Ltd is one of the leading China square magnifier lamp manufacturers and suppliers,Website:http://www.ritekmagnifier.com, welcome to contact us.RT111.01 Lens size: 7.5" x 6.2" (189 x 157mm) Diopter options: 3 or 6 Light source: 2x 9 Watt compact lamp Arm with internal springs Arm length: 36" Clour options: White, Black Table clamp included