Valgro Engineers Private Limited manufactures Surface Conditioning Spiro-Bands. Valgro Engineers Private Limited is an ISO 9001:2000 and TUV SUD German certified company. Surface Conditioning Spiro-Bands provides a high initial rate of cut, resulting in a faster finishing, removal rate. These are effective tools used for blending and finishing flat and contoured surfaces. Valgro Engineers Private Limited Surface Conditioning Spiro-Bands are available in coarse, medium and very fine grade. It has a diameter of 25 mm. To 100 mm. And the width is 25 mm. To 100 mm.