BVV Stainless Steel Laboratory Scissor Jacks Adjustable height laboratory scissor jack. The platform is 4″/6″/8″ & the durable 304 stainless steel heavy-duty lab lifts with very little effort necessary!Specifications:304 Stainless SteelPlatform size: 4″ x 4″ / 6″ x 6″ / 8″ x 8″.