Belt grinding machines for grinding, polishing and deburring; centerless grinding machines; pipe notching machines; radial grinding machines; accessories for afore-mentioned machines, namely, grinding belts, gliding bases for plane grinding in the nature of graphite-lubricated metal plates for flat grinding, abrasive attachments in the nature of contact wheels, drive disks and contact rollers, polishing wheels, acrylic eye protection screens for spark protection, swivel joints for adjusting work area, power-operated, metal guides for machine power tools in the nature of linear guides, guide rails, guide rollers, longitudinal stops and prism guides, clamps for holding treated material steady, suction devices comprised of suction pumps to extract shavings during grinding process, dust filters, dust collectors, swarf bags, namely, bags attached to machine tools to collect shavings, supporting parts in the nature of metal braces for machine tools