410 B 11 Tooth Sprocket 1/2" ID, 1/8" keyway & two set screws

410 B 11 Tooth Sprocket 1/2" ID with a 1/8" keyway & two set screws, zinc plated.  Hub width is .875". 

This sprocket has a 1/2" pitch x 1/8" wide teeth with a 1/8" key way.

These sprockets are made to be used with 410 & 410H chain but can also be used with the wider 415, 415H (1/2" pitch x 3/16" wide teeth) and

with the wider #41 chain that is (1/2" pitch x 1/4" wide teeth).

CHAIN KMC 1/2" x 1/8" Sold By The Foot.
http://www.staton-inc.com/store/products/CHAIN_KMC_1_2_x_1_8_Sold_By_The_Foot-1120-0.html

Sram PC - 1 Power Chain 1/2" x 1/8" 114 Links
http://www.staton-inc.com/store/products/Sram_PC_1_Power_Chain_1_2_x_1_8_114_Links-1110-0.html

Chain 410H Silver Nickel, 1/2" x 1/8". 98 Links
http://www.staton-inc.com/store/products/Chain_410H_Silver_Nickel_1_2_x_1_8_98_Links-612-0.html

Master Link / Connecting Link 410H 1/2" x 1/8" Silver - Nickel
http://www.staton-inc.com/store/products/Master_Link_Connecting_Link_410H_1_2_x_1_8_Silver_Nickel-606-0.html

Offset or half Link 1/2" x 1/8" 410 # 43 # 65 Chain
http://www.staton-inc.com/store/products/Offset_or_half_Link_1_2_x_1_8_410_43_65_Chain-1121-25.html