5 Depressed Center Wheel Competitive Cross Reference Relative Wheel Life Test done with 4 - 1/2 x 1/4 x 7/8 wheels   Catalog 5 Pc . 10 Pc . Size Max . RPM Std . Pkg . Style Order No . Price Ea . Price Ea . Price Ea . METAL / STEEL/STAINLESS – CUTTING – TYPE 27   4 1/2 X . 045 X 7/8 13,580 20 Gemini NOR19548 $    2 . 13 $    2 . 02 $    1 . 92 METAL / STEEL – CUTTING – TYPE 27   4 1/2 X 1/8 X 7/8 13,580 10 Norton Metal NOR75910 $    1 . 33 $    1 . 26 $    1 . 20 PIPE NOTCHING – TYPE 27   9 X 1/8 X 5/8 - 11 6,600 10 Norzon Plus NOR49066 $ 13 . 68 $ 13 . 00 $ 12 . 31 METAL / STEEL – CUTTING / NOTCHING / LIGHT GRINDING – TYPE 27   4 X 1/8 X 3/8 15,280 20 NorZon Plus NOR29884 $    5 . 99 $    5 . 69 $    5 . 39 4 - 1/2 x 1/8 x 5/8 - 11 13,580 20 NorZon Plus NOR30445 8 . 08 7 . 67 7 . 27 4 - 1/2 x 1/8 x 5/8 - 11 13,580 20 CHARGER Plus NOR29853 4 . 09 3 . 89 3 . 68 4 - 1/2 x 1/8 x 5/8 - 11 13,580 20 NorZon Plus NOR30435 8 . 08 7 . 67 7 . 27 4 - 1/2 x 1/8 x 7/8 13,580 20 NorZon Plus NOR30444 7 . 13 6 . 78 6 . 42 5 x 1/8 x 5/8 - 11 12,225 20 CHARGER Plus NOR29857 4 . 66 4 . 43 4 . 19 7 x 1/8 x 5/8 - 11 8,600 10 NorZon Plus NOR38855 11 . 06 10 . 51 9 . 95 7 x 1/8 x 5/8 - 11 8,600 10 CHARGER Plus NOR29862 6 . 43 6 . 11 5 . 79 7 x 1/8 x 5/8 - 11 8,600 10 GEMINI Disc NOR39259 4 . 98 4 . 73 4 . 48 9 x 1/8 x 5/8 - 11 6,600 10 NorZon Plus NOR48897 14 . 62 13 . 89 13 . 16 9 x 1/8 x 5/8 - 11 6,600 10 GEMINI Disc NOR48983 6 . 67 6 . 34 6 . 00 Depressed Center Wheel Starting Recommendations by Material Heavy Duty Grinding   General Duty Grinding Light Grinding Blending and Surface Materials Best Performance Better Value Initial Value Finishing Cutting Preparation Angle/Channel Iron NorZon Plus Type 27 Charger Plus Type 27 Gemini Type 27 Charger Flex & AVOS Type 29 Gemini Type 27 Bear - Tex Bar Stock/I - Beams Rapid Strip Cast Iron/Pipe NorZon Plus Type 27 Charger Plus Type 27 Gemini Type 27 Charger Flex & AVOS Type 29 NorZon Plus Pipe   Rapid Strip Notcher Stainless/Alloys NorZon Plus Type 27 Charger Plus Type 27 Gemini SS Type 27 Charger Flex & AVOS SS Type 29 Gemini SS Type 27 Rapid Strip Aluminum/Brass/Bronze NorZon Plus Type 27 Charger Plus Type 27 Gemini ALU Type 27 Charger Flex & AVOS ALU Type 29 Gemini   ALU Type 27 Rapid Strip Asphalt/Brick/Concrete Masonry Type 27 Masonry Type 27 Masonry Type 27 Masonry Type 27 Masonry Type 27 Rapid Strip Fiberglass/Plastic - Charger Flex   Gemini Flexible Charger Flex & AVOS Type 29 Gemini Type 27 Rapid Strip Type 29 Type 27 Paint/Rust - - Metal Type 27 - - - Norton Flexovit Metabo Pferd Sait Tyrolit Walter NorZon Plus FLEXON – ZA -