This is a very useful tool for Bible study. It will give you thousands of cross references. The unique aspect of this work is that it breaks down verses for you with cross references going word by word through the Bible. So for example, John 3:16 the first word is God. The NTOSK begins with God and gives you "Jeremiah 31:3; Luke 2:14; Romans 5:8; 2 Corinthians 5:19-21; Ephesians 2:4-7; 2 Thessalonians 2:16; Titus 3:4-7; 1 John 3:1; 4:9, 10, 14, 19; Revelation 1:5." And that is all from the first word in the passage!
This book also has some word studies here and there. Overall, this is a very helpful book. I highly recommend it.